JALIL, Abdul. Alumni Networks and Economic Reinforcement in Pesantren Ummussabri. Shirkah: Journal of Economics and Business, [S.l.], v. 4, n. 2, dec. 2019. ISSN 2503-4243. Available at: <https://shirkah.or.id/new-ojs/index.php/home/article/view/268>. Date accessed: 24 oct. 2021. doi:http://dx.doi.org/10.22515/shirkah.v4i2.268.